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| author |   Vasily Gorbik <gor@linux.ibm.com> | 2020-10-13 16:19:37 +0200 |
|---|---|---|
| committer |   Heiko Carstens <hca@linux.ibm.com> | 2020-11-09 11:20:58 +0100 |
| commit | 13b5bd8af41ca56fd11cc0281f2a1201d8342233 (patch) | |
| tree | c20aefe3ec57dd1f34370d8a53250201aef41778 /arch/s390 | |
| parent | Linux 5.10-rc3 (diff) | |
| download | linux-dev-13b5bd8af41ca56fd11cc0281f2a1201d8342233.tar.xz linux-dev-13b5bd8af41ca56fd11cc0281f2a1201d8342233.zip | |
s390/head: set io/ext handlers to disabled wait
Set io/ext handlers to disabled wait in the initial lowcore, so that they
are effective right from the kernel start, when a boot method used does
not rewrite this part of the lowcore for its own needs (i.e. kexec, z/vm
ipl reader boot, qemu direct boot, load from removable media or server).
When the kernel is loaded by zipl, scsi loader or qemu loader, some or
all of the io/ext/pgm handlers addresses might be rewritten. Rewrite them
to initial values again as early as possible.
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/boot/head.S | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/arch/s390/boot/head.S b/arch/s390/boot/head.S index 1a2c2b1ed964..bc34ad2c2e49 100644 --- a/arch/s390/boot/head.S +++ b/arch/s390/boot/head.S @@ -62,8 +62,12 @@ __HEAD .org __LC_RST_NEW_PSW # 0x1a0 .quad 0,iplstart + .org __LC_EXT_NEW_PSW # 0x1b0 + .quad 0x0002000180000000,0x1b0 # disabled wait .org __LC_PGM_NEW_PSW # 0x1d0 .quad 0x0000000180000000,startup_pgm_check_handler + .org __LC_IO_NEW_PSW # 0x1f0 + .quad 0x0002000180000000,0x1f0 # disabled wait .org 0x200 @@ -303,6 +307,9 @@ ENTRY(startup_kdump) sam64 # switch to 64 bit addressing mode basr %r13,0 # get base .LPG0: + mvc __LC_EXT_NEW_PSW(16),.Lext_new_psw-.LPG0(%r13) + mvc __LC_PGM_NEW_PSW(16),.Lpgm_new_psw-.LPG0(%r13) + mvc __LC_IO_NEW_PSW(16),.Lio_new_psw-.LPG0(%r13) xc 0x200(256),0x200 # partially clear lowcore xc 0x300(256),0x300 xc 0xe00(256),0xe00 @@ -320,7 +327,12 @@ ENTRY(startup_kdump) .long 0x8000 + (1<<(PAGE_SHIFT+BOOT_STACK_ORDER)) - STACK_FRAME_OVERHEAD .align 8 6: .long 0x7fffffff,0xffffffff - +.Lext_new_psw: + .quad 0x0002000180000000,0x1b0 # disabled wait +.Lpgm_new_psw: + .quad 0x0000000180000000,startup_pgm_check_handler +.Lio_new_psw: + .quad 0x0002000180000000,0x1f0 # disabled wait .Lctl: .quad 0x04040000 # cr0: AFP registers & secondary space .quad 0 # cr1: primary space segment table .quad .Lduct # cr2: dispatchable unit control table |